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doc-src/TutorialI/Trie/Option2.thy
author
nipkow
Fri, 02 Jun 2000 15:19:18 +0200
changeset 9016
d61c76716984
parent 8771
026f37a86ea7
permissions
-rw-r--r--
*** empty log message ***
(*<*)
theory Option2 = Main:;
(*>*)
datatype 'a option = None | Some 'a;
(*<*)
end
(*>*)